How to read the band →
Solid line = floor (spellings that unambiguously belong to the group). Shaded band up to the dashed edge = ceiling (the most it could reach if every ambiguous spelling counted here).
Enzo
Enzo has been climbing in recent years. All-time it's been given to 34,998 U.S. babies, the 176th most common name by sound today, peaking at 4,568 in 2024, with 4,565 in 2025.
Enzo has no common alternate spellings by sound.
Rising
Source: U.S. Social Security Administration, “National data” baby-names files (1880–2025).